2)
\(\dfrac{40}{8}-\dfrac{5}{8}=\dfrac{35}{8}\)
\(\dfrac{20}{5}-\dfrac{12}{5}=\dfrac{8}{5}\)
\(\dfrac{10}{10}-\dfrac{4}{10}=\dfrac{6}{10}=\dfrac{3}{5}\)
\(\dfrac{30}{14}-\dfrac{28}{14}=\dfrac{2}{14}=\dfrac{1}{7}\)
3)
hộp bánh còn lại số cái là
\(4-\dfrac{7}{4}=\dfrac{9}{4}\) (cái bánh)
\(2.\\ a.5-\dfrac{5}{8}=\dfrac{40}{8}-\dfrac{5}{8}=\dfrac{35}{8}\\ b.4-\dfrac{12}{5}=\dfrac{20}{5}-\dfrac{12}{5}=\dfrac{8}{5}\\ c.1-\dfrac{4}{10}=\dfrac{10}{10}-\dfrac{4}{10}=\dfrac{8}{10}=\dfrac{4}{5}\\ d.\dfrac{15}{7}-2=\dfrac{15}{7}-\dfrac{14}{7}=\dfrac{1}{7}\)
3.
số bánh còn lại là:
4 - 7/4 = 9/4 (bánh)
a) = 35/8
b) = 8/5
c) = 6/10
d) = 1/7
3/ 5/4